What should I send to 100 10 to cancel HD?

When using VoLTE, HD will be displayed at the signal sign at the top of the mobile phone screen. You can turn off Unicom VoLTE (high definition voice) service in the following ways:

1, SMS: after TDVOLTE is sent to 100 10, reply "y" to turn off the VOLTE function;

2. China Unicom APP: Select "Service >"; Processing > VoLTE HD call ";

3. online business hall: click "handle > VoLTE HD call";

4. Close the business hall through the local Unicom customer service hotline or with the owner ID.